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nilfs2: get rid of BUG_ON use in btree lookup routines 

The current btree lookup routines make a kernel oops when detected
inconsistency in btree blocks.  These routines should instead return a
proper error code because the inconsistency usually comes from
corruption of on-disk metadata.

This fixes the issue by converting BUG_ON calls to proper error
handlings.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-10-10 22:58:10 +09:00
parent 648f4e3e50
commit 9b945d537d
1 changed files with 16 additions and 2 deletions
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18
fs/nilfs2/btree.c
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@ -444,6 +444,18 @@ nilfs_btree_get_node(const struct nilfs_btree *btree,
nilfs_btree_get_nonroot_node(path, level);
}
static inline int
nilfs_btree_bad_node(struct nilfs_btree_node *node, int level)
{
if (unlikely(nilfs_btree_node_get_level(node) != level)) {
dump_stack();
printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n",
nilfs_btree_node_get_level(node), level);
return 1;
}
return 0;
}
static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
struct nilfs_btree_path *path,
__u64 key, __u64 *ptrp, int minlevel)
@ -467,7 +479,8 @@ static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
if (ret < 0)
return ret;
node = nilfs_btree_get_nonroot_node(path, level);
BUG_ON(level != nilfs_btree_node_get_level(node));
if (nilfs_btree_bad_node(node, level))
return -EINVAL;
if (!found)
found = nilfs_btree_node_lookup(node, key, &index);
else
@ -512,7 +525,8 @@ static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree,
if (ret < 0)
return ret;
node = nilfs_btree_get_nonroot_node(path, level);
BUG_ON(level != nilfs_btree_node_get_level(node));
if (nilfs_btree_bad_node(node, level))
return -EINVAL;
index = nilfs_btree_node_get_nchildren(node) - 1;
ptr = nilfs_btree_node_get_ptr(btree, node, index);
path[level].bp_index = index;